Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease a Dutch oven.
In a large mixing bowl, whisk together the flour, baking soda, and salt.
Pour in the buttermilk and stir with a wooden spoon or spatula until the dough just begins to come together.
Turn the dough out onto a lightly floured surface and gently knead it a few times to bring it together. Be careful not to overwork the dough.
Shape the dough into a round loaf and place it on the prepared baking sheet or Dutch oven.
Use a sharp knife to cut a deep cross into the top of the dough.
Bake for 35-40 minutes, or until the bread is golden brown and sounds hollow when tapped on the bottom.
Remove from the oven and allow to cool slightly before slicing and serving.